JP2603277Y2 - Propeller shaft torsion damper - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional damper for a propeller shaft, and more particularly, to a torsional damper mounted on an outer diameter portion of a yoke of a propeller shaft for an automobile to buffer torsional vibration.

[0002]

2. Description of the Related Art Conventionally, as this kind of torsional damper, for example, the one disclosed in Japanese Utility Model Laid-Open No. 2-144825 is known. In this example, a propeller shaft that transmits rotational power from a transmission to a final gear has a structure in which a vibration ring is held concentrically via an elastic body at an outer diameter portion of a yoke of a joint portion for the purpose of buffering torsional vibration. A dynamic damper is provided.

[0003]

However, in such a conventional torsion damper of a propeller shaft, the elastic body held between the inner cylindrical portion of the dynamic damper press-fitted into the outer diameter portion of the yoke and the vibration ring. However, internal heat is generated with torsional vibration and the temperature tends to be high. In addition, the temperature of the elastic body increases with an increase in the ambient temperature of the vehicle itself. For this reason, there is a problem that the temperature deviates from the effective temperature range for the differential noise. That is, it is known that there is a relationship as shown by a curve C in FIG. 3 between the temperature (° C.) of such a torsional damper and its natural frequency (Hz), and the temperature increases. , The natural frequency decreases. On the other hand, the effective temperature range for the differential noise is from T1 (° C.) to T2 as shown in FIG.
The temperature is T2 (° C) due to the limited range of (° C)
With the above, the natural frequency falls below the differential noise region, and a sufficient vibration damping effect cannot be obtained.

An object of the present invention is to pay attention to the above-mentioned conventional problems, and to solve the problems by damping the torsional vibration and reducing the differential noise by providing the damper itself with a self-cooling function. It is an object of the present invention to provide a torsion damper having a propeller shaft that can be used.

[0005]

A torsion damper for a propeller shaft according to the present invention includes an inner cylindrical ring member integrally fitted to a companion flange of a propeller shaft, and two axial end portions of the inner cylindrical ring member. An inner peripheral surface is integrally joined to the pair of cooling blades disposed on the outer peripheral side and protruding substantially radially outward, and the inner cylinder ring member between the pair of cooling blades. A ring-shaped elastic body and a vibration ring joined to an outer peripheral surface of the elastic body so as to surround the pair of cooling blades are provided.

[0006]

According to the present invention, with the rotation of the propeller shaft, the cooling blades disposed on the outer peripheral sides of both ends in the axial direction of the inner cylindrical ring member integrally fitted to the companion flange of the propeller shaft. Also go around together,
Air is sent to the elastic members located on the sides and the vibration ring joined to the outer peripheral side of the elastic members to cool them. Further, heat generated inside the elastic body is transmitted from the elastic body to the inner cylinder ring member, and is radiated from the companion flange and the cooling blade.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. here,
Reference numeral 1 denotes a first shaft of a propeller shaft, 2 denotes a center bearing that rotatably supports the first shaft 1, and 3 denotes a companion flange provided at a joint portion between the first shaft and the second shaft. Is fixed to the shaft end by bolts 4. Reference numeral 5 denotes a yoke member connected to the companion flange 3, and reference numeral 6 denotes a torsion damper press-fitted and fixed to an outer peripheral portion of the companion flange 3.

FIG. 1 shows a torsion damper 6 according to this embodiment.
(B), the inner cylinder ring member 7 press-fitted into the outer peripheral portion of the companion flange 3, the vibration ring member 8 forming the outer cylinder, and the circumference between the inner cylinder ring member 7 and the vibration ring member 8. And an elastic body 9 vulcanized and bonded in the direction.
A ring-shaped blade member 10 is press-fitted into the inner cylindrical ring member 7 from both sides of the elastic body 9. FIG. 2 shows such a torsion damper 6 taken out, wherein (A) shows a disassembled state before press-fitting, and (B) shows a front view of the blade member 10 alone. As shown in these figures, the blade member 10 has a plurality of blade portions 10B cut and raised from the ring main body 10A at equal positions in the circumferential direction, and rotates with the rotation of the companion flange 3. 6
In the above, the blades 10B cut and raised in the radial direction agitate the airflow that rotates in the same direction, thereby sending wind to each member, or increasing the outer surface area of the inner cylindrical ring member 7 by the blades 10B. As a result, the heat radiation action is increased, so that heat can be taken from each component of the torsion damper 6 together with the elastic body 9 and cooled.

In the embodiment described above, the blade member 1
In FIG. 0, the blade portion 10B is cut and raised from the ring main body 10A. However, separate blade portions 10B may be implanted in the integral ring main body 10A at positions equivalent to the circumferential direction by welding or the like. Further, the shape and direction of the blades 10B are not limited to those shown in FIG. 2. For example, each blade 10B may be inclined with respect to the axial direction of the propeller shaft, and the shape is not limited to a square. In short, it goes without saying that any structure may be used as long as the air around the torsion damper 6 can be efficiently stirred during the rotation to obtain a cooling effect. .

[0011]

According to the torsion damper of the propeller shaft of the present invention, the radially outward portion of the inner cylindrical ring member, which is integrally fitted to the companion flange of the propeller shaft, is provided at both ends in the axial direction. Since the cooling blades that protrude are arranged, the air around the elastic body is directly stirred, and the temperature of the torsional damper itself, especially the temperature of the elastic body, falls to a temperature range where the differential noise reduction effect can be obtained. In particular, in the use in summer or extremely hot regions where the ambient temperature is high, differential noise can be reduced by suppressing torsional vibration.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a configuration of the present invention by a sectional view (A) of a propeller shaft joint portion and a front view (B) of a torsion damper itself.

FIG. 2 is an explanatory view showing a disassembled side view (A) of the configuration of the torsion damper according to the present invention and a front view (B) of only the blade member thereof.

FIG. 3 is a temperature-dependent characteristic curve of a torsional damper.

[Explanation of symbols]

 Reference Signs List 3 companion flange 6 torsion damper 7 inner cylinder ring member 8 vibration ring member 9 elastic body 10 blade member 10A ring main body 10B blade portion

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16F 15/10-15/12 B60K 17/22

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner cylinder ring member integrally fitted to a companion flange of a propeller shaft, and disposed on outer peripheral sides of both ends in the axial direction of the inner cylinder ring member, and protruding substantially radially outward. A pair of cooling blades , a ring-shaped elastic body whose inner peripheral surface is integrally joined to the inner cylindrical ring member between the pair of cooling blades , and the pair of cooling blades. A vibration ring joined to an outer peripheral surface of the elastic body so as to surround the torsion damper.